Bedienungsanleitung Inventum AC127W (Seite 22 von 64) (Deutsch, Englisch, Holländisch, Französisch)

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CAUTION: The use of silicone containing sealing agents could disrupt the operation of some types of leak detection

equipment. Intrinsically safe components do not have to be disconnected before working at them.

8. Repairs to intrinsically safe components (Appendix DD.5)

Do not connect permanently inductive or capacitive loads to the circuit without checking whether the allowed voltages and

currents for the equipment used are exceeded.

Intrinsically safe components are the only types of component at which you are allowed to work while they are live in the

presence of combustible ambient air. Only use test equipment with the correct certiﬁcations.

Only replace components by parts that correspond with the manufacturer's speciﬁcations. The use of deviating parts could

cause ﬁre when refrigerant escapes to the ambient air as a result of a leak.

9. Cables (Appendix DD.6)

Check that the cables are not exposed to wear, corrosion, excessive pressure, vibrations, sharp edges or other negative

ambient inﬂuences. When checking, also consider the consequences of ageing and constant vibration of compressors or fans.

10. Detection of combustible refrigerants (Appendix DD.7)

Never use potential ignition sources when looking for or tracing refrigerant leaks. Do not use a halogen lam (or any other

detector with an open ﬂame).

11. Leak detection methods (Appendix DD.8)

The following leak detection methods may be used for systems containing combustible refrigerants.

Preferably use electronic leak detectors to detect combustible refrigerants. Sometimes the sensitivity of such equipment

is not sufﬁcient, or they must be recalibrated. (Always calibrate detection equipment in a room that is free from refrigerant.)

Check that the detector is not a potential ignition source and that it is suitable for the refrigerant used. Adjust the leak

detection equipment at a percentage of the refrigerant's LFL (lower ﬂammable limit) and calibrate the equipment to the

refrigerant used and the correct gas percentage (maximum 25%).

Leak detection liquids are also suitable for use with most refrigerants, but avoid the use of chlorinated substances, as the

chlorine could also react with the refrigerant and affect the copper piping.

If a leak is suspected, all open ﬂames must be extinguished or removed.

If a refrigerant leak is found that requires soldering, all refrigerant should ﬁrst be drained from the system, or the refrigerant

should be isolated (by means of valves) in a section of the system away from the leak. Then ﬂush the system with oxygen free

nitrogen (OFN), both prior to and during the soldering process.

12. Draining and emptying (Appendix DD.9)

When opening a cooling circuit in order to perform repairs - as well as for all other purposes - the correct regulations and

procedures should be observed at all times. In addition, always try to work as safely as possible, due to the ﬂammability of the

refrigerants. For that reason, always use the following procedure:

• Remove the refrigerant;

• Flush the circuit with inert gas;

• Empty the system;

• Flush once more with inert gas;

• Open the circuit by sawing or soldering.

Collect the refrigerant in a suitable storage container. Flush the system with OFN (oxygen free nitrogen) to make the system

safe. It is possible that you must repeat this process a few times. Never use compressed air or oxygen to ﬂush a system.

Flush the vacuum system by allowing OFN to ﬂow into it and then ﬁll the system with OFN until the operating pressure is

achieved. Then allow this to escape to the atmosphere and make the system vacuum again. Repeat this process until there is

no more refrigerant in the system. After the last OFN ﬂush, the system must be de-aerated to atmospheric pressure to make

the work possible. This is an absolute condition when soldering work has to take place at the piping.

Ensure that the exhaust of the vacuum pump is not in the vicinity of ignition sources and that the surrounding area is

sufﬁciently ventilated.

13. Filling procedures (Appendix DD.10)

In addition to the standard procedures when ﬁlling, also observe the following requirements.

- When using the ﬁlling equipment, prevent different refrigerants from getting mixed. Hoses and pipes must be as short as

possible to minimise the amount of refrigerant that they contain.

- Always place cylinders upright.

- Earth the cooling system before ﬁlling the system with refrigerant.

- Mark the system when it is ﬁlled (if this has not yet been done).

- Ensure the cooling system is not excessively ﬁlled.

Perform a pressure test with OFN (oxygen free nitrogen) before ﬁlling the system. Check the system for leaks after ﬁlling,

butbefore commissioning. Always perform a ﬁnal leak test before leaving the location.

14. Decommissioning (Appendix DD.11)

In order to perform this procedure, it is essential that the technician has fully familiarised himself with the equipment and all

its parts. It is always recommended to drain and dispose the refrigerants used safely. Prior to the work, always take an oil and

refrigerant sample when reuse of the drained refrigerant requires prior analysis. It is essential to check whether there is a power

supply present, before starting the work.

22 • English

Inventum AC127W Seite 22

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